Day 4: 12:00 P.M.-1:00 P.M.

Jack initiates a fierce gun battle with the terrorists as he races to rescue Heller and Audrey before the military strike begins. Dina questions her own dedication to their cause when her husband reveals his plans for Behrooz. Driscoll and Curtis uncover new evidence that points to an even bigger attack by the terrorists. Audrey has an awkward meeting with her husband, and Heller butts heads once again with his son.